Hi folks, thank you for a great forum. I've already gotten help/solutions a couple of times. Now, my Aircon smells "sour". I bought the car second hand, and the car stood still for abt 1 year prior me buying. I have changed both airfilters - the one in engine bay as well as the one under glove compartment. But smell is still there when sunroof or windows are open - like the sour air is sucked in to the cabin when roof or windows are open. Any bright solutions?

So you tried ozone?

@W205C43PFL thank you for great suggestion, and no, I have not. I will try that since I have such a machine. what you reckon, 20-30 mins of running?

You're welcome : ) happy to help
MB also has an HVAC cleaner https://mbworld.org/forums/e-class-w...m-cleaner.html

Yes do like 30-45 minutes or more as see fit. Do not breathe in this stuff though https://mbworld.org/forums/c450-c43-...ml#post8367443

Be sure to also click on the links to other threads within the thread.

And then air it out for a day or so.

@W205C43PFL Thank you again! I note some threads mention Ozone may damage the plastic and/or leather and/or foam of the indside of the cabin, is that true and to be avoided or exagerated?

You're welcome : ) it is not without truth, as ozone is an oxidant I would proceed with caution however detailers been using ozone for a while and never really had issues.

For reference, detailers also use it for up to 90 minutes. I guess if you are very worried, start with a short duration.

@W205C43PFL I'll try a 30 minute run and see if it works. Thanks a lot

You are very welcome!

How did it turn out?

@W205C43PFL Thanks follow up. I did it last night for approx 15 minutes with "re-circulation" on, to get the Ozon into system. Seems ok so far. Perhaps I will do another round of approx 30 minutes to get rid of a bit more. Thank you again for the tip. Wish everybody a great weekend ahead

Awesome! Glad to help and glad it worked! You as well!